feat: add frontend + backend + database to retrieve and compute news from Yahoo

backend/internal/ai/provider.go

@@ -0,0 +1,27 @@
+package ai
+
+import (
+	"context"
+	"fmt"
+)
+
+type Provider interface {
+	Name() string
+	Summarize(ctx context.Context, prompt string) (string, error)
+	ListModels(ctx context.Context) ([]string, error)
+}
+
+func NewProvider(name, apiKey, model, endpoint string) (Provider, error) {
+	switch name {
+	case "openai":
+		return newOpenAI(apiKey, model), nil
+	case "anthropic":
+		return newAnthropic(apiKey, model), nil
+	case "gemini":
+		return newGemini(apiKey, model), nil
+	case "ollama":
+		return newOllama(endpoint, model), nil
+	default:
+		return nil, fmt.Errorf("unknown provider: %s", name)
+	}
+}